HappyHorse model decryption: A complete analysis of the AI video dark horse that mysteriously topped the Arena and then disappeared
In early April 2026, a mysterious AI video model named HappyHorse quietly appeared on the Artificial Analysis Video Arena blind test leaderboard. Both its V1 and V2 versions simultaneously climbed to the top of the Text-to-Video and Image-to-Video rankings, shattering Elo scores and leaving industry heavyweights like Seedance 2.0, Kling 3.0, and PixVerse V6 in…
